[59] Davis. The Seine, the Meuse and the Moselle. Nat’l Geog. Mag., Vol. VII, pp. 181–202, and 228–238. An article which throws much light on the behavior of rivers.

[60] Another view has been advocated by Tarr, Am. Geol. Vol. XXI, pp. 351–370.

[61] Campbell. Bull. Geol. Soc. of Am., Vol. XIV, p. 277.

[62] Willis. Physiography of the United States. The Northern Appalachians.

[62a] Willis. Physiography of the United States. The Northern Appalachians.

[63] For excellent accounts of the rivers of the Appalachian Mountains see Davis, Rivers of Northern New Jersey, Nat’l Geog. Mag., Vol. II, pp. 81–110; and Rivers of Pennsylvania, op. cit., pp. 183–253; Willis, The Northern Appalachians, Physiography of the United States, pp. 169–202; Hayes, the Southern Appalachians, op. cit., pp. 305–336; Hayes and Campbell, The Geomorphology of the Southern Appalachians, Nat’l Geog. Mag., Vol. VI, pp. 63–126, and Hayes, Physiography of the Chattanooga District, 19th Ann. Rep. U. S. Geol. Surv., Pt. II, pp. 1–58.

[64] This is the case at Davis and Lone Star. Capt Howell, Miss. Riv. Commission.

[65] Russell. Rivers of North America, p. 279.

[66] Russell. Rivers of North America, p. 279.

[67] Hayes. Physiography of the Chattanooga District, 19th Ann. Rep., U. S. Geol. Surv., Pt. II, pp. 9–58. See, also, Hayes and Campbell, Geomorphology of the Southern Appalachians, Nat’l Geog. Mag., Vol. VI, pp. 63–126.